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MAGNETIC-RESONANCE DETERMINATION OF THE ELECTRONIC DENSITY OF STATES AND THE METAL NONMETAL TRANSITION IN THE LAH2-LAH3 SYSTEM
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UNSPECIFIED (1991) MAGNETIC-RESONANCE DETERMINATION OF THE ELECTRONIC DENSITY OF STATES AND THE METAL NONMETAL TRANSITION IN THE LAH2-LAH3 SYSTEM. In: INTERNATIONAL SYMP ON METAL-HYDROGEN SYSTEMS, FUNDAMENTALS AND APPLICATIONS, BANFF, CANADA, SEP 02-07, 1990. Published in: JOURNAL OF THE LESS-COMMON METALS, 172 (Part A). pp. 411-418. ISSN 0022-5088.
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Abstract
Proton spin-lattice relaxation rate R1 and La-139 Knight shift measurements have been utilized to study the electronic density of states N(E(F)) at the Fermi level and the metal-non-metal (MNM) transition in the lanthanum hydrides, LaH(x)(2 less-than-or-equal-to x less-than-or-equal-to 3), in samples prepared from highest purity Ames Laboratory lanthanum as well as from lanthanum containing controlled low levels (less than 300 ppm) of gadolinium. In the pure samples, free-electron-like metallic behavior is found for all compositions up to x almost-equal-to 2.8 at temperatures T less-than-or-equal-to 200 K. In the gadolinium-doped samples the Gd3+ ion spin fluctuations, characterized by the ion spin-lattice relaxation time tau-i, contribute an additional proton spin relaxation rate. Measurements of this rate for x < 2.8 show that tau-i is-proportional-to T-1 at all temperatures, indicating metallic behavior. However, for x greater-than-or-equal-to 2.8 and T > 250 K, tau-i is-proportional-to T-5, showing that Gd3+ spin relaxation is then governed by the two-phonon process typical of insulating solids.
Item Type: | Conference Item (UNSPECIFIED) | ||||
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Subjects: | Q Science > QD Chemistry T Technology > TN Mining engineering. Metallurgy |
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Journal or Publication Title: | JOURNAL OF THE LESS-COMMON METALS | ||||
Publisher: | ELSEVIER SCIENCE SA LAUSANNE | ||||
ISSN: | 0022-5088 | ||||
Official Date: | 20 August 1991 | ||||
Dates: |
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Volume: | 172 | ||||
Number: | Part A | ||||
Number of Pages: | 8 | ||||
Page Range: | pp. 411-418 | ||||
Publication Status: | Published | ||||
Title of Event: | INTERNATIONAL SYMP ON METAL-HYDROGEN SYSTEMS, FUNDAMENTALS AND APPLICATIONS | ||||
Location of Event: | BANFF, CANADA | ||||
Date(s) of Event: | SEP 02-07, 1990 |
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